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A circular ring rotates steadily around its axis at a frequency of f Hz, producing a current given by I = qf/T. What is the magnetic field at the center of the ring?
- The current is expressed as I = qf/T.
- The magnetic field is given by B = μ₀I/2R.
- The magnetic field is represented as B = μ₀qf/2R.
- None of these statements are correct.
Correct answer: The magnetic field is represented as B = μ₀qf/2R.
Solution
The magnetic field at the center of a current-carrying ring is given by B = μ₀I/2R. Substituting I = qf (since current is charge per unit time and the ring rotates with frequency f), we get B = μ₀qf/2R. Thus, option C is correct.
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